Without using trigonometric tables, evaluate. ^2 25^ - ^2 65^ - Vidyadip

Question

Without using trigonometric tables, evaluate.
$\cos ^2 25^{\circ}-\sin ^2 65^{\circ}$

✓

Answer

$0$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[2 Mark Question Answer]" from Trigonometrical Ratios→Trigonometrical Ratios — all question types→MATHEMATICS STD 9 question papers→ICSE Board STD 9 question papers→ICSE Board question paper generator→

Similar questions

Evaluate the following$: \tan(78^\circ + \theta ) +\operatorname{cosec}(42^\circ + \theta ) - \cot(12^\circ - \theta ) - \sec(48^\circ - \theta )$

Convert decimals into a vulgar fraction in its lowest term:
$0.65$

Factorise:
$a^4+343 a$

Draw the graph of:
y + 5 = 0

If $\log _{10} x = a,$ express the following in terms of $x: 10 ^{-a}$

Using the standard formulae, expand:
$(x+y)(x-y)\left(x^2+y^2\right)$

Factorise : $8 a^3+27 b^3$

Simplify : $\frac{\sqrt[4]{243}}{\sqrt[4]{3}}$

Factorise:
$x^4-81$

Factorise $: 4 x^2+\frac{1}{(4 x)^2}+1$